2fAcids, alkalis and titrations

Syllabus objectives

• 2.28describe the use of litmus, phenolphthalein and methyl orange to distinguish between acidic and alkaline solutions
• 2.29understand how to use the pH scale, from 0–14, can be used to classify solutions as strongly acidic (0–3), weakly acidic (4–6), neutral (7), weakly alkaline (8–10) and strongly alkaline (11–14)
• 2.30describe the use of universal indicator to measure the approximate pH value of an aqueous solution
• 2.31know that acids in aqueous solution are a source of hydrogen ions and alkalis in a aqueous solution are a source of hydroxide ions
• 2.32know that alkalis can neutralise acids
• 2.33describe how to carry out an acid-alkali titrationSeparate Chemistry only